fix(usage): silence errcheck on deferred rows.Close

CI errcheck flagged the bare 'defer rows.Close()' in
computeSourceTotals. Wrap in a closure that discards the close
error explicitly; an error here is non-actionable since we have
already drained the rows and logged any iteration failure.

Refs: #9862
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

core/http/auth/usage.go

@@ -290,7 +290,7 @@ func computeSourceTotals(db *gorm.DB, userID, apiKeyID string, since time.Time,
 	if err != nil {
 		xlog.Warn("computeSourceTotals: by-key Rows() failed", "error", err)
 	} else {
-		defer rows.Close()
+		defer func() { _ = rows.Close() }()
 		out := make([]KeyTotal, 0)
 		for rows.Next() {
 			var (